move main code to a function

drive-download

@@ -37,6 +37,9 @@ def folder_id(folder_name):
     return file1['id']
 
 
+def main():
+    global seen, drive
+
     read_seen()
 
     gauth = GoogleAuth(settings_file=os.path.expanduser('~/.config/drive-download/settings.yaml'))
@@ -51,7 +54,7 @@ file_names_dupes = [f for f, count in collections.Counter(file_names).items() if
     if len(file_names_dupes) > 0:
         print('Duplicate filenames on Drive!')
         for fn in sorted(file_names_dupes):
-        print(fn)
+            print(shlex.quote(fn))
         sys.exit(1)
 
     for file1 in file_list:
@@ -70,4 +73,7 @@ for file1 in file_list:
             print("{} exists locally!".format(shlex.quote(local_filename)))
             sys.exit(2)
 
+
+main()
+
 # vim:tw=100: